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Help reading a file to decode or encode

Hello I've ran into hopefully a small problem. A few weeks ago we were given an assignment to decode or encode a phrase given by a user. This week we have to change our code so it users a file and not user input. This is the original working code. **this is not entire code just the part I need help with**

My newest error is on my return phrase; in getPhrase. It says incompatible types- found java.lang.String[] but expected java.lang.String. I know this is because I'm mixing an array with a String... I just know how to fix it...